New Member

Recently ordered 1 67mm Tele-Photo Len and thot it will increase my current zoom by factor of 2. To my surprised, it did not perform as it should and worst the image came out very burl and look like those fish-eye type that is circular at the circumference. Attached is the photo from ebay:-

Can another advise whether it is true that this type of method is not working.

New Member

Yes, a 2x teleconverter would reduce 2 stop, and the 1.4x will reduce 1 stop. For example, if your lens max apperture is f/2.8, it will become f/5.6 with 2x teleconverter, or f/4 with 1.4x teleconverter.